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This is somewhat Python-based, but I feel it is more a Bitcoin question than a Python question.
The problem is running pybitcointools and python-bitcoinlib concurrently, as both packages use the name bitcoin. This BountySource discussion sums up the issue succinctly:
It seems that on PyPi the name
bitcoinis free but... (the) ...python-bitcoinlibpackage on installation uses the same name "bitcoin" as the currentpybitcointools, and I've had them clash (one overwrote the other)
It's also worth noting that using pip, pip install pybitcointools = version 1.1.15, whereas pip install bitcoin = version 1.1.25 (newer version).
I generally prefer Python 2.7 but whatever solutions may be applicable just to Python 3.x would also be greatly appreciated, as using both libraries concurrently would be great.